Democrats are drawing their red line against debt limit concessions — again.

Senate Budget Committee Chairwoman Patty Murray (D-Wash.) will release a letter later Friday saying Democrats will not heed any GOP demands in exchange for hiking the debt limit next month in the latest round of the fiscal fights that have plagued the Capitol.

“We will not negotiate over whether or not the United States of America should pay its bills,” Murray writes in the letter, provided in advance to POLITICO. “And once again, before they get any further down this damaging path, we call on our Republican colleagues to not play politics with our economic recovery.”

Murray, the fourth-ranking member of Senate Democratic leadership, also wants House Republicans to declare that they will allow a clean debt-limit increase at their annual retreat in Cambridge, Md., next week, according to the letter.

“As we have repeatedly shown, attempts to avoid compromise by putting the full faith and credit of the United States on the line will not succeed,” Murray writes. “The only way we can get anything done in a divided government is through compromise, not threats or hostage-taking.”

In the last round of debt-limit fights in fall 2013, Murray and Senate Finance Committee Chairman Max Baucus (D-Mont.) fired off a similar letter to their colleagues. The agreement in October that ended the 16-day government shutdown also suspended the debt limit until Feb. 7. Republicans did not extract concessions on the debt limit that time around.

Treasury Secretary Jack Lew urged Congress earlier this week to deal with the debt limit issue by that date, and stressed that so-called extraordinary measures his department can use to continue paying the nation’s bills will most likely run out by late February.

A spokesman for Speaker John Boehner (R-Ohio) said in response to Lew’s letter that a clean debt limit won’t pass the Republican-led House.

The budget agreement that Murray reached with House Budget Committee Paul Ryan (R-Wis.) did not cover the debt limit issue. Ryan, in an appearance in San Antonio on Thursday, said Republicans are discussing obscure Obamacare provisions — known formally as the reinsurance fund and risk corridors — as a potential point of negotiation on the debt limit.